interface and opEquals

[Oliver]

Hi everyone,

the following code works and does what it is supposed to do. I am, however, unsure if this is the "right" way to do it. I read somewhere that opEquals should take an Object as argument. I can not get the code to work with Object as argument. Can anyone explain this to be, what am i missing? Thanks to everyone,

Oliver

------------------------

import std.stdio;

interface Vi {
    void f();
    int opEquals( Vi );
    //int opEquals( Object );
    //int opEquals();
}

class C1 : Vi {
    void f() { writefln( "C1: ", itsInt ); }
    this( int i ) { this.itsInt = i; }
    int opEquals( Vi o ) { 
        C1 test = cast(C1)o;
        return test && this.itsInt == test.itsInt;
    }   
    //int opEquals( C1 test ) { return this.itsInt == test.itsInt; }
private:
    int itsInt;
}

int main() {
    assert( 1 == 1.0 );
    Vi myInt1 = new C1(1);
    Vi myInt2 = new C1(1);
    myInt1.f();
    assert( cast(C1)myInt1 == cast(C1)myInt2 );
    assert( myInt1 == myInt2 );
    return 0;
}